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Old 05-18-2011, 10:14 AM   #1
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need to improve mpg

I have a 1998 wrangler, 242 6cly fuel injected. What can i do to improve gas mileage?

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Old 05-18-2011, 10:18 AM   #2
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buy a new car, walk, or take the bus. I once cared about the mpg but now its settled in and mpg doesn't mean anything to me any more.

you can drive smart by coasting and not using your brakes. Having your windows closed at speeds of 45 and more along with top. keep stock tires. get tune-up when necessary. thats about it

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Old 05-18-2011, 10:19 AM   #3
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New exhaust is a good start, Better gas mileage and more horse power. Also, you can change the gearing where if you want good mpg on the highway I recommend gearing down though you will sacrifice mpg in the lower gears but pick up some serious torque! if you've got big tires get smaller ones, keep your oil and filters regularly changed. Other than that, your kinda stuck.
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Old 05-18-2011, 10:24 AM   #4
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Mileage? 02 sensors got me Back to normal. If you want better than that your screwed.
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Old 05-18-2011, 10:24 AM   #5
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Quote:
Originally Posted by johngutierrez View Post
I have a 1998 wrangler, 242 6cly fuel injected. What can i do to improve gas mileage?



seriously. don't drive the jeep. problem solved.
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Old 05-18-2011, 10:26 AM   #6
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There is no way to improve the mpg to better than how it was when the factory manufacturered it. If there was, you can bet the house Jeep would have done so to help them meet the ever increasing requirements from the feds.
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Old 05-18-2011, 10:30 AM   #7
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I uadded some off the shelf fuel injector fluid to my gas at walmart but it threw the CEL. I noticed a small improvement to gas mileage though. If you can see about having some fuel injector fluid run directly into the engine. Always Stuck did this for me and it worked much better and didnt throw the CEL. i noticed right away that the engine idled better, MPG improved (i was getting 13mpg before). i havent re-calculated what i am getting now, but it was signifficant enough to notice on the fuel gauge.
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Old 05-18-2011, 10:34 AM   #8
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It's extremely rare with today's gasolines to ever need to add any additional aftermarket fuel injector cleaner to the gas. Modern gasolines have had more than enough fuel injector cleaning additives in them to keep the fuel injectors clean for many years now. That wasn't the case during the first 5-10 years fuel injected cars started hitting the market but it has been the case for about the last 20 years.

I used to have 20-25 new car dealerships as clients and I made a point of asking the mechanics how many clogged fuel injectors they had seen. Only the old mechanics had and none of the under 40 mechanics had.
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Old 05-18-2011, 10:37 AM   #9
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Install a flux capacitor
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Old 05-18-2011, 10:40 AM   #10
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Quote:
Originally Posted by Jerry Bransford View Post
It's extremely rare with today's gasolines to ever need to add any additional aftermarket fuel injector cleaner to the gas. Modern gasolines have had more than enough fuel injector cleaning additives in them to keep the fuel injectors clean for many years now. That wasn't the case during the first 5-10 years fuel injected cars started hitting the market but it has been the case for about the last 20 years.

I used to have 20-25 new car dealerships as clients and I made a point of asking the mechanics how many clogged fuel injectors they had seen. Only the old mechanics had and none of the under 40 mechanics had.

interesting, you would know about that stuff better than me, my jeep was only driven in the summer (mainly on dirt roads) and sat all winter so maybe that played a factor in it. all i know is that i noticed a signifficant improvement w/o changing driving habits. i was putting a full tank in every week if not more frequently and now i am going through signifficantly less gas (i get about a week and a half out of a tank now) still need to crunch the #'s on what my mpg is now, but it better for sure.
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Old 05-18-2011, 10:40 AM   #11
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I get about 15 babying it and almost never going over 60 on the highway. I was getting about 13.5 when I was doing 70 on the highway.

If your getting less than that, when was the last time you replaced your spark plugs or your o2 sensors?
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Old 05-18-2011, 10:42 AM   #12
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Quote:
Originally Posted by UnlimitedLJ04

seriously. don't drive the jeep. problem solved.
That's funny
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Old 05-18-2011, 10:49 AM   #13
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Quote:
Originally Posted by Peepers
I get about 15 babying it and almost never going over 60 on the highway. I was getting about 13.5 when I was doing 70 on the highway.

If your getting less than that, when was the last time you replaced your spark plugs or your o2 sensors?
Same here.. I asked the same ? also on the 02's

When someone ask about mpg, not always is it "how do I increase" sometimes
what the person is trying to ask is "what can I do to get my mpg back to what it is supposed to be". I get 15 now and before I replaced my sensors and intake gasket I was getting 9-10. What I am trying to say is there is no need for the "buy a Honda" comments and help the person
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Old 05-18-2011, 11:08 AM   #14
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interesting, you would know about that stuff better than me, my jeep was only driven in the summer (mainly on dirt roads) and sat all winter so maybe that played a factor in it. all i know is that i noticed a signifficant improvement w/o changing driving habits. i was putting a full tank in every week if not more frequently and now i am going through signifficantly less gas (i get about a week and a half out of a tank now) still need to crunch the #'s on what my mpg is now, but it better for sure.
If your Jeep was only driven in the Summer and then you parked it for the winter you gas could have started to turn on you so you were driving on crappy gas. As you started to drive it again and added fresh gas the old gas was used up and the newer fresh gas caused your mileage increase so gradually you saw an increase in MPG
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Old 05-18-2011, 11:14 AM   #15
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The previous owners (my grandparents) had it at their summer house, i got it from them in December and its my DD. the MPG's have been 13 through the beginning of May and only noticed the improved MPG's after the fuel injector cleaner.
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Old 05-18-2011, 11:17 AM   #16
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Quote:
Originally Posted by meyers

If your Jeep was only driven in the Summer and then you parked it for the winter you gas could have started to turn on you so you were driving on crappy gas. As you started to drive it again and added fresh gas the old gas was used up and the newer fresh gas caused your mileage increase so gradually you saw an increase in MPG
X2 this is true. Not much but I do notice an increase.
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Old 05-18-2011, 11:25 AM   #17
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My 4 banger got 20 mpg the other day but then I was in the slow lane all the way. With the price of gas and my long commute, 100 mi @ day, I get gas every three days and it cost me 59.00 last night.
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Old 05-18-2011, 11:26 AM   #18
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I usually suggest cutting up a refrigerator box and making a large cone shape out of it. Then duct tape that to the front of the jeep for less wind resistance.
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Old 05-18-2011, 11:26 AM   #19
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I usually suggest cutting up a refrigerator box and making a large cone shape out of it. Then duct tape that to the front of the jeep for less wind resistance.

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Old 05-18-2011, 11:41 AM   #20
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I usually suggest cutting up a refrigerator box and making a large cone shape out of it. Then duct tape that to the front of the jeep for less wind resistance.
Thats how I won the soap box derby. Same areodynamics.
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Old 05-18-2011, 12:23 PM   #21
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Quote:
Originally Posted by johngutierrez
I have a 1998 wrangler, 242 6cly fuel injected. What can i do to improve gas mileage?
U did not answer our ?. Don't listen to some of these a**holes. How many miles you have on the jeep? If you are getting 15+ that is normal. If not and the jeep is still stock maybe you might have a mechanical proplem.
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Old 05-18-2011, 12:44 PM   #22
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It's extremely rare with today's gasolines to ever need to add any additional aftermarket fuel injector cleaner to the gas. Modern gasolines have had more than enough fuel injector cleaning additives in them to keep the fuel injectors clean for many years now. That wasn't the case during the first 5-10 years fuel injected cars started hitting the market but it has been the case for about the last 20 years.

I used to have 20-25 new car dealerships as clients and I made a point of asking the mechanics how many clogged fuel injectors they had seen. Only the old mechanics had and none of the under 40 mechanics had.
I guess that depends on what part of the country you are from. Up here we have extremely dirty fuel and getting the injectors cleaned is recomended by most shops in the area and one of the first things on the list after plugs wires etc. Almost all the shops around here do injector cleaning and recomend using a bottle in the tank every third or 4th tank of fuel. I got mine done after 100 thou and it ran noticably better. Slight improvement on the mileage too.
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Old 05-18-2011, 12:50 PM   #23
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Originally Posted by Wallygator

I guess that depends on what part of the country you are from. Up here we have extremely dirty fuel and getting the injectors cleaned is recomended by most shops in the area and one of the first things on the list after plugs wires etc. Almost all the shops around here do injector cleaning and recomend using a bottle in the tank every third or 4th tank of fuel. I got mine done after 100 thou and it ran noticably better. Slight improvement on the mileage too.
$$$$$
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Old 05-18-2011, 01:09 PM   #24
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Pretty obvious, but watch your speed on the highway. I'm not sure what the standard speed limits are where you're at but I find I use almost 20% more fuel I haul ass at 75 than if I stay at 65-70. There's just this point where you feel the boxy body catching the wind and the engine really has to work hard to keep it going.
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Old 05-18-2011, 01:40 PM   #25
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$$$$$
75 bucks is not much to spend every 60 thousand or so miles
3 bucks every 3rd or 4th tank for maintenance
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Old 05-18-2011, 01:47 PM   #26
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Quote:
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I guess that depends on what part of the country you are from. Up here we have extremely dirty fuel and getting the injectors cleaned is recomended by most shops in the area and one of the first things on the list after plugs wires etc. Almost all the shops around here do injector cleaning and recomend using a bottle in the tank every third or 4th tank of fuel. I got mine done after 100 thou and it ran noticably better. Slight improvement on the mileage too.
So you are saying that Shell or Chevron or other major gas companies distribute gas differently depending on where you live. Then the gas companies must really hate you and or the area in which you live. They give the Southern states the good fuel and you Northeners the crappy fuel?
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Old 05-18-2011, 01:55 PM   #27
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I just saw you are in Canada. So Shell Canada makes fuel differently than Shell?
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Old 05-18-2011, 02:13 PM   #28
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i hate when someone asks a question and gets a cheap answer.

there are always things you can do to improve on your mpg just like there are always ways to improve your hp. firstly i would make sure that your engine is running properly. air filters, and such. second is your ride set-up. the more lift you have the less aerodynamic you are. by staying stock you keep it reasonable. i personally wouldn't be happy, but if you lowered your suspension it would help with mpg. also the agressiveness and size of your tires play a big part. smaller tires in a light tread are much easier to run than snow tires or mud tires.

try not to drive agressively and keep your speed down.

these are all things that can help with your mpg. you may not want to do all of these things, so pick and choose what you'd like.
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Old 05-18-2011, 02:15 PM   #29
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why does everyone think the jokers are a-holes? Personally, I don't understand why so many people ask about better gas mileage in a jeep that is shaped like a brick. Thats why I suggest the fridge box idea. And yeah, it may sound funny as hell but in reality, it would help MPGs.

But ok, on topic playing along I havn't seen anyone mention that low tire pressures can kill your mileage. Check your tires first, even a couple pounds low on one tire has a really bad efect on MPG. Also, pick your "high rpm" limit such as 2500 and under no circumstances are you to run higher than that point. Do it for a week, you'll save $$$. Take offs are a bit slower, but it truely does save MPGs. As well, jack it up and ensure each wheel spins freely. Bad wheel bearings and/or brakes dragging will suck up the gas at a rediculous rate to.
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Old 05-18-2011, 02:22 PM   #30
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I guess that depends on what part of the country you are from. Up here we have extremely dirty fuel and getting the injectors cleaned is recomended by most shops in the area and one of the first things on the list after plugs wires etc. Almost all the shops around here do injector cleaning and recomend using a bottle in the tank every third or 4th tank of fuel. I got mine done after 100 thou and it ran noticably better. Slight improvement on the mileage too.
It is a huge money maker for the dealers. Minimal cost on their end.

I am curious though why the fuel in BC is extremely dirty it all comes from the same refineries. Is it the actually supply system that is tainted?

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